| Nurse practitioner | 83 |
| Emergency medicine | 17 |
| Licensed clinical social worker | 17 |
| Internal medicine | 16 |
| Family practice | 15 |
| Physical therapist (private practice) | 14 |
| Anesthesiology | 11 |
| Physician assistant | 11 |
| General surgery | 8 |
| Certified Registered Nurse Anesthetist (CRNA) | 7 |
| Hospitalist | 7 |
| Obstetrics/gynecology | 6 |
| Pulmonary disease | 6 |
| Optometrist | 6 |
| Diagnostic Radiology | 5 |
| Podiatry | 5 |
| Mass Immunization Roster Billers | 5 |
| Mental Health Counselors | 5 |
| Infectious disease | 4 |
| Orthopedic surgery | 4 |
| Chiropractic | 4 |
| Pathology | 4 |
| Clinical psychologist | 4 |
| Nephrology | 4 |
| Speech / language pathology | 3 |
| Occupational therapist (private practice) | 3 |
| Urology | 3 |
| Hematology/oncology | 3 |
| Gastroenterology | 3 |
| Cardiology | 3 |
| Interventional Cardiology | 2 |
| Psychiatry | 2 |
| Dermatology | 2 |
| Ambulatory Surgical Center | 2 |
| Audiologist (billing independently) | 2 |
| Neurology | 2 |
| Critical care (intensivists) | 2 |
| Otolaryngology | 2 |
| Pediatric medicine | 1 |
| Ophthalmology | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Sports Medicine | 1 |
| Marriage and Family Therapist | 1 |
| Radiation oncology | 1 |
| Allergy/immunology | 1 |
| Osteopathic manipulative therapy | 1 |
| Registered Dietician/Nutrition Professional | 1 |
| Endocrinology | 1 |
| Certified clinical nurse specialist | 1 |
| Certified nurse midwife | 1 |
| Oral surgery (dentists only) | 1 |
| Pharmacy | 1 |
| Rheumatology | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Pain Management | 1 |